Please go to this page: http://ow.ly/6fNiP (Type exactly as it appears if you cannot click it) and download Malwarebytes for free. Simply click on Download file under the download link and forum link. Download, save, and run (install) it. You do not have to pay for the program at any time. It may prompt you for a trial; click “Decline”. Malwarebytes will then download updates, and then run the Quick Scan (Perform quick scan > Scan) and "Remove Selected" if it finds any items.
Then, please restart and try Facebook again.
Let me know how it goes; thank you.